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When you are a liquid and want to become a gas, you need to find a lot of energy. Once you can direct that energy into your molecules, they will start to vibrate. If they vibrate enough, they can escape the limitations of the liquid environment and become a gas. When you reach your boiling point, the molecules in your system have enough energy to become a gas. The reverse is true if you are a gas.
Solid to a liquid to a gas. The materials around us are at room temperature. When we describe a material as being a solid, liquid or gas, we are usually describing them at room temperature. We can change a material into its other states by heating it up or cooling it down. For example, water is a liquid at room temperature. If we cool it down, it changes into a solid  ice. I f we heat it up, it changes into a gas  steam.